Article ID : 00025090 / Last Modified : 08/30/2016

Why are some hard drives split into two partitions, the C: Drive and D: Drive?

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In order to improve the performance of the video editing software on the computer, the hard disk drive on the computer has been formatted into two partitions, (C:) and (D:). Most video editing software saves files to the (D:) partition. This prevents large video captures from consuming the available space on the (C:) partition and possibly affecting system performance.

Digital video consumes 2.1 gigabytes for every 9.5 minutes of captured digital video and it is very possible that a you could fill the (C:) partition to capacity very quickly. Due to the way the operating system dynamically manages and resizes virtual memory, if the (C:) partition was filled to capacity, the operating system may lock up and not be able to restart. To maintain optimum performance of video edition software, the (D:) partition should be defragmented or formatted regularly.


  • Information stored on the (D:) partition will be preserved in cases where the (C:) partition is formatted or recovered while the (D:) partition is not. The recovery process differs by model and a recovery of the (C:) partition only is not available on all models.
  • The (D:) partition is not necessarily just for video editing. The (D:) partition can also be used for all the same purposes (saving data files, installing software, etc.) as the (C:) partition. To do this, simply select the (D:) partition instead of the (C:) partition when saving a file or installing software.
  • Not all computer models have a (D:) partition.